Micrometer-calipers.



No. 729,979. PATBNTBD JUNE 2,1903.

F. SPALDING, t .L H MIGRQMETBB'GALIPERS.

APPLICATION FILED JULY' 24. 1902.

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UNITED STATESv '.Patented J' une 2, V1903.

PATENT NCEijiInE.

ERANK sPALDING, OE PROVIDENCE, RHODE IsLAND, AssIGNOR To BROWN .t sI-IARPE MANUFACTURING COMPANY, OE PROVIDENCE,

RHODE ISLAND.I

M IOROM ETER-OALiPsRs.

SPECIFICATION forming part of Letters Patent No. 729,970, dated J une 2, 1903.

Application filed July 24. 1902. Serial No. 116,789. (No model.)

To all whom t may concern:

Be it known that I, FRANK SPALDING, a citizen of the United States, residing at Provi'- dence, in the county of Providence and State' backlash the measurementwill be inaccurate In practice the spindlere` and unreliable. quires to be turned a number of 'turns to adjust the same to the object to be measured-j During this movement the spindle vshould turn freely in the screw-threaded nut. When4 the spindle is adjusted and the measurement is to be taken, the screw-thread engagement of the spindle with the nut should be a close.

fit, free from possible backlash. When the measurement is taken, the spindle should be firmly locked. IIeretofore devices have been used to clamp the unthreaded portion of the spindle. Such devices Were usfually'operated by a rotatable' part acting ona'split sleeveor tongue and were notreliableforthe microscopic measurements now required. In practice I find that owing to theinclined \lshaped surfaces of the screwrthreadsthe spindle may be securely locked by bringing the split part the spindle.

of the internally-screwfthreadedfnut in close` contact with the screw-threaded portionof the spindle, and I have designed a microme?. ter-caliper in which the screw-thread engagement of the spindle may be adjusted While in'- use, so that the spindle may turn freely for. adjustment, may turn without backlash while the measurement is taken, and maythen be locked by a tube movinglongitudinal-lywith My invention consists in the peculiarand novel construction and the combination of the parts, more fully-set forth hereinafter, by which the above-described results may 'be obtained.

Figure l is a sideview of my improved micrometer-caliper. Fig. 2 is a longitudinal sectional view taken through the center of threaded. diameter and fits thebore of the end a2 and *the cylindrical porti-on of ,the spindle b with `a,,closesliding tit. The end d? of the tube is provided with the seat cl3, on which the screw.

the spindle. Fig. 3 is a transverse sectional view on the line. of Fig. 2. Fig. 4. is an end view of the operating-tube, and Fig. 5 is a side View of the same. Fig. 6 is an end View of the split internally-sorew-threaded nutsleeve, and Fig. 7 is aside view of the same. Fig. 8 is a side. View', and Fig. 9 'an edge view, of the actuating-ring.

Similar marks of reference indicate corre. -sponding parts in all the figures.

VvIn the drawings, c, indicates the frame of the caliper; a', the anvil end of the frame; a?,

the spindle end of theframe, and a3 the -ex-` I ternally-graduated tubular sleeve extending from theend a2 and forming with this end the. support of theV spindle b,- The end a2 has @the lslot a4' extendingtransversely through ihe sa'me-` The tubular sleeve as is internally screw-threaded at its outer end to re.

. split nut c',`the cyliudricalportion c2 of which normally fits the bore of 'the sleeve. The tapering end c3 of the sleeve c cooperates with the internally-tapering end'lc1 of the actuating-tube d. The n'ut'jc is longitudinally split upto the flange c5 intotwo` or'more parts, so

that these parts maybe forced inward toward a common center and the internal screw-nut contracted. The 'actuating-'tube d fits the bore ofthe sleeve as with a sliding fit. The

portion d of the tube is externally screw- The end 'oliis preferably of less d4 bears to hold the tube d against rotation.

The internally-screw-th'readed ring eis in engagementlwith the screw-threaded portion d/ of the actuating-tube d and issupported in the slot a4. The spindle b has the cylindrical end b' supported in' the endfcl2 of the tube 03 and the screw-'threaded portion; supported in the nut c. The graduated and usually milled sleeve b2 forms part of and-rotates with the spindle b.

In a micrometer-caliper of my construction the screw-threaded spindle may turn in the nut freely while it is adjusted for taking the measurement. The ring e may now be ro- 'fated to slide the tube d in the bore of the sleeve a3 until the tapering end of the tube is forced over the tapering end c3 of the nut to bring the internally-screw-threaded split portions of the nut into close contact with the screw-thread on the spindle, and when the measurementhas been taken the spindle may be locked by forcing the tapering end c4 between the Wall of the bore in the sleeve and the split parts of the nut. Bythe reverse rotation ofthe ring e the spindle may be again released. All the adjustments may be made while the caliper is in use.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-- l. Inamicrolneteicaliper,thecombination with the sleeve extending from one end of the frame and the screw-threaded spindle, of a longitudinally-split nut provided with a tapering end, a tube in the bore of the sleeve, and means for sliding the tube on the bore and over the tapering end of the nut, as described.

2. A micrometer-caliper having the screwspindle connected with a longitudinally-split nut, in combination with a tube, and means for sliding the end of the tube over the end of the split nur, as and for the purpose described.

3. Inan1icrometer-caliper,thecombination with the sleeve, the longitudinallysplit nut having the tapering end, and the screw'- threaded spindle,of the actuating-tube d provided with the tapering end c4 and the screwthreaded portion d', means for holding the ac A drical part c2, the actuating-tube (Z having the tapering end c4, means for holding the actu- 4 ating-tube against rotation, and means for sliding the tapering end of the actuatingtube over the tapering end of the nut, as described.

5. Ina micrometer-caliper,the combination with the frame cl provided with an anvil end ci', a spindle end CL2, al graduated tubular sleeve a3, and a slot a4, and the screw-threaded spindle?) having the graduated sleevefbg, of the split nut c provided with the cylindrical part c2 and the tapering end c3, the actuating-tube d having the tapering end c4 and the screw-thread d', and the internallyscrewthreaded ring e located in the slot a4, as de-` scribed. o

6. In a micrometer-caliper, a tubular sleeve forming part of the frame, a split nut secured in the end of said sleeve, a screw-threaded spindle engaging with the split nut, and an actuating-tube adapted to be moved longitu- 6 dinally over part of the split nut, as and for the purpose described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

FRANK SPALDING.

Witnesses:

ADA E. HAGERTY, J. A. MILLER Jr. 

